Sharp SX80J9, Руководство по обслуживанию

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18
SX80J9
18-2 18-1
SET SUB-
Colour
Check IC801
and its
peripherals.
D
COLOUR PRODUCED
Colour in B/W mode.
Colour control circuit detective.
Colour saturation control does not
work.
Improper colour.
Turn Colour control to minimum.
Does colour disappear?
Turn up and down Colour control.
Does colour gain go up and
down?
Can the sub-colour be readjusted
in service mode?
Turn on Colour system forced
switch. Does colour appear?
Killer circuit:
Check IC801
and its
peripherals.
Yes Yes
White
balance:
Check RGB
output circuit
of IC801.
Check IC801.
No
Yes No
Check IC801.
Check D1606
and its
peripherals.
Yes No
NTSC3.58:
Check X802,
IC801 and
their
peripherals.
PAL,
SECAM,
NTSC4.43:
Check X801,
IC801 and
their
peripherals.
No
Check IC801
and PIP unit.
Check IC803.
Yes No
No
Is chroma input level of IC801
proper?
Ref. Value: 100 ~ 500mVp-p.
Yes
Fix control to
coloured system.
No
Is SCP signal waveform at pin (2)
of IC801 proper? Are signal waveforms at TP801 and TP802
proper? (Pins (10) and (11) of IC901)
Is FBP signal waveform at pin
(25) of IC801 proper?
Yes
Yes
Check Q803,
IC451,IC5461 and their
peripherals.
No
No
Are signal waveforms at pins (29)
and (30) of IC803 proper?
Yes
TROUBLE SHOOTING TABLE (Continued)